US7663341B2 - System for controlling voltage balancing in a plurality of lithium-ion cell battery packs and method thereof - Google Patents

System for controlling voltage balancing in a plurality of lithium-ion cell battery packs and method thereof Download PDF

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Publication number
US7663341B2
US7663341B2 US11/722,776 US72277605A US7663341B2 US 7663341 B2 US7663341 B2 US 7663341B2 US 72277605 A US72277605 A US 72277605A US 7663341 B2 US7663341 B2 US 7663341B2
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Prior art keywords
balancing
cell
voltage
cells
synchronization signal
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US11/722,776
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US20080129247A1 (en
Inventor
Dal-Hoon LEE
Han-Ho Lee
Jee-Ho Kim
Eguchi Yasuhito
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LG Energy Solution Ltd
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LG Chem Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0014—Circuits for equalisation of charge between batteries
    • H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00302—Overcharge protection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/20—Charging or discharging characterised by the power electronics converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the invention relates to a battery balancing system reading voltages of cells in a multicell battery pack and comparing the read voltages to charge or discharge the cells, and more particularly to a battery balancing system and method for reading voltages of all cells in a battery pack with a same timing so as to eliminate a cell voltage reading error due to a voltage reading time difference.
  • a battery power supply unit is an electric power source supplying an energy to a related electronic device and a multicell battery pack is applied as the supply unit.
  • a multicell battery pack is applied as the supply unit.
  • the multicell pack rather than a single cell, it is possible to apply a high voltage or to increase a capacity.
  • the cell itself has charge/discharge characteristics, a voltage of each cell tends to be unbalanced as time goes by.
  • the voltage difference between the cells in the battery pack may generate an un-balancing between the battery cells, thereby causing a capacity loss of the battery pack.
  • various battery balancing systems and methods for balancing each cell so as to prevent overcharges of all battery cells and to uniformly charge the cells.
  • the method has also a disadvantage that a cell voltage of the entire battery pack becomes lower than its original lowest voltage if the number of low voltage cells is increased.
  • FIG. 1 is a schematic view showing an apparatus for adjusting a voltage balancing using a line selecting device in a lithium ion cell battery according to the prior art
  • FIG. 2 is a view illustrating a voltage reading timing in a lithium ion cell battery according to the prior art.
  • the cell terminal voltages are read through the line voltage selecting device 1 in the battery balancing system, it can be seen that the cell terminal voltages are not varied if the load current is not changed in the cells (B 1 , B 2 , B 3 , B 4 ). Accordingly, the CPU 3 decides that the voltage of the cell terminal is balanced. However, the terminal voltages of the cells are varied when the load current is changed. Accordingly, when the load current is changed in real-time, the CPU 3 decides that the voltages of the cell terminals are out of balance, due to the voltage reading difference resulting from the load variance as time goes by.
  • the read voltage values of the cells may be different due to the difference of times at which the terminals are selected.
  • a battery balancing system or method capable of eliminating a voltage reading error of cells in a cell system, rapidly performing a voltage balancing and increasing an accuracy of a voltage balancing.
  • the battery balancing system has diverse condition limitations. For example, it performs a voltage balancing only when the system itself is not operated. Due to the limitations, the voltage balancing operation becomes complicated, an unnecessary time is consumed and an accuracy of the voltage balancing is decreased.
  • An object of the invention is to read a cell terminal voltage in a lithium ion cell battery after holding the voltage for a same retention time and thus to eliminate a reading error of the cell voltage resulting from a change of the terminal voltage as time goes by, thereby improving an accuracy of a cell balancing.
  • Another object of the invention is to receive voltage data of another battery pack via communication means in a battery balancing system consisting of a plurality of battery packs so as to adjust a voltage balance of a battery pack or to receive a target value of a voltage balance so as to adjust a voltage balance.
  • a cell balancing adjusting system adjusting a voltage balancing of cells in a lithium ion multicell battery pack and having a system controller, the system comprising: a multicell battery pack consisting of a master module and a slave module, a CPU located in the system controller and outputting a synchronization signal for each of cells in the master module and the slave module, a first vertical interface transmitting the synchronization signal outputted from the CPU to the master module and a second vertical interface transmitting the synchronization signal to the slave module via the first vertical interface.
  • the synchronization signal may comprise a signal for synchronizing the cells of the master module and a signal for synchronizing the master module and the slave module.
  • the synchronization signal may comprise a signal for synchronizing an interval of a plurality of multicell battery packs.
  • the CPU may output a reading hold signal for holding instantaneous voltages of the cells in the multicell battery pack and a reading balance signal for performing reading and balancing of all cell voltages.
  • the vertical interface may comprise a photo coupler transmitting the synchronization signal in parallel.
  • a battery balancing system comprising a plurality of multicell battery packs including a first CPU reading terminal voltages of cells in a master module and a slave module, a system controller collecting, calculating and controlling cell related data from the multicell battery packs, a second CPU installed in the system controller and receiving data of all cells in the multicell battery packs to provide a balancing target value necessary for each of the battery packs, and a DC-DC converter controlling a direction of current flowing to each cell, based on the target value, to adjust a voltage balance.
  • the second CPU may compare the balancing target value and the voltage of each cell and control a current direction of the DC-DC converter so that a balancing current flows to a charge direction in a cell when the voltage of the cell is lower than the balancing target value.
  • the second CPU may compare the balancing target value and the voltage of each cell and control a current direction of the DC-DC converter so that a current flows to a discharge direction in a cell when the voltage of the cell is higher than the balancing target value.
  • the data may comprise a maximum voltage, a minimum voltage and a mean value thereof.
  • the second CPU may output a synchronization signal for synchronizing the multicell battery packs.
  • the balancing system may further comprise a vertical interface provided between the multicell battery packs and transmitting the synchronization pulse.
  • the terminal voltages of the cells are read with a same timing in the lithium ion cell battery, thereby improving an accuracy of the voltage balancing.
  • FIG. 1 is a schematic view showing an apparatus adjusting a voltage balancing using a line selecting device in a lithium ion cell battery according to the prior art
  • FIG. 2 is a view showing a voltage reading timing of cells in a lithium ion cell battery according to the prior art
  • FIG. 3 shows a voltage balancing system for cells in a multicell battery pack according to an embodiment of the invention.
  • FIG. 4 is a view showing a voltage reading timing of cells in a lithium ion cell battery according to an embodiment of the invention.
  • FIG 5 shows alternative embodiment of the invention.
  • FIG. 3 is a block diagram of a system performing a voltage balancing of cells of a plurality of multicell battery packs 2 , 7 , 8 , 9 according to an embodiment of the invention.
  • the system comprises the plurality of multicell battery packs 2 , 7 , 8 , 9 and a system controller 1 .
  • the system controller 1 comprises a CPU 1 - 1 , and collects and calculates diverse cell related data of each battery pack from the plurality of multicell battery packs 2 , 7 , 8 , 9 and system inside sensors 1 - 4 , 1 - 5 , 1 - 13 , thereby controlling the whole system.
  • the controller 1 transmits data or a control signal to an apparatus using the plurality of multicell battery packs.
  • Output terminals of cells ( 4 S+ 4 S) of the multicell battery pack 2 are connected in series.
  • a highest output terminal (TB+) and a lowest output terminal (TB ⁇ ) of the multicell battery pack are used as a power output terminal of the system.
  • the output terminal (TB ⁇ ) of the multicell battery pack passes through a current detecting device 1 - 4 and an emergency interception device 1 - 8 .
  • the current detecting device 1 - 4 is provided to detect current flowing in a cell and a resistance or Hall device is used as the current reading device.
  • the multicell battery pack 2 comprises a CPU 2 - 1 , a DC-DC converter 2 - 2 , an auxiliary switch 2 - 3 , a master module 3 and a slave module 5 .
  • the master module 3 and the slave module 5 have a substantially same structure.
  • the master module 3 comprises four cells 4 S, a protecting circuit 3 - 1 and a balance control circuit 4 .
  • the slave module 5 comprises four cells 4 S, a protecting circuit 5 - 1 and a balance control circuit 6 .
  • the balance control circuits 4 , 6 have a function of converting a terminal voltage of each cell into a ground potential so that the CPU 2 - 1 can read the terminal voltage.
  • the balance control circuits 4 , 6 of the master module 3 and the slave module 5 are respectively structured such that they can transmit/receive a signal through a vertical interface 6 - 1 (VIF).
  • a vertical interface 4 - 1 in the balance control circuit 4 of the master module 3 can transmit/receive a signal with the multicell battery pack 7 below thereof.
  • the signal comprises a signal for synchronizing the multicell battery pack 2 and a signal for synchronizing an interval of the multicell battery pack 2 and the multicell battery packs 7 , 8 , 9 .
  • These signals are transmitted/received between all the multicell battery packs 2 , 7 , 8 , 9 through the vertical interfaces, thereby synchronizing all the battery packs.
  • the CPU 2 - 1 of the multicell battery pack 2 reads a terminal voltage of each cell in the master module 3 and the slave module 5 .
  • the read voltage data is transmitted to the CPU 1 - 1 of the system controller 1 via a local communication interface 2 - 4 .
  • the balance control circuit 4 has an alternation switch so that a balance current can flow in each cell.
  • the alternation switch can be controlled by the CPU 2 - 1 .
  • the DC-DC converter 2 - 2 is inputted with outputs (TB+, TB ⁇ ) of the multicell battery pack.
  • the DC-DC converter 2 - 2 controls the auxiliary switch 2 - 3 and the balance control circuit 4 to enable the balance current to flow in each of the cells.
  • the CPU 1 - 1 of the system controller 1 receives data of a maximum voltage, a minimum voltage, a mean value thereof and the like of all cells in the battery pack and provides a balancing target value necessary for each battery pack.
  • each multicell battery pack controls the current and thus adjusts a balance thereof.
  • the CPU 1 - 1 compares the balancing target value and a voltage of each cell and controls a current direction of the DC-DC converter so that a balancing current flows to a charge direction if the voltage of the cell is lower than the balancing target value. On the contrary, if the voltage of the cell is higher than the balancing target value, the CPU controls a current direction of the DC-DC converter so that a current flows to a discharge direction in the cell.
  • the CPU 1 - 1 outputs a synchronization pulse RB (reading & balance pulse) and a synchronization pulse RH (reading hold pulse).
  • FIG. 4 shows that the CPU 1 - 1 of the system controller 1 outputs the synchronization pulses to read terminal voltages of the cells with a same timing, according to an embodiment of the invention.
  • the voltage balancing system of the invention transmits the synchronization pulses thereof to the vertical interface 6 - 1 of the slave module 5 via the vertical interface 4 - 1 of the master slave 3 .
  • the synchronization pulses are sequentially transmitted to the vertical interface 6 - 1 of the multicell battery pack 2 through the vertical interface in the master module of the multicell battery pack 9 .
  • the system having the plurality of multicell battery packs can also read the terminal voltages of all the cells in each of the battery packs with a same timing.
  • the two synchronization pulses (RB, RH) are used to synchronize the battery balancing system.
  • the battery balancing system may be synchronized with one synchronization pulse only.
  • the synchronization signals are sequentially transmitted using the vertical interface, they may be transmitted in parallel using a photo coupler.
  • a cell alternation switch of the balance control circuit 4 of the master module 3 comprises a current switch 4 - 5 and a voltage switch 4 - 4 .
  • the current switch 4 - 5 enables the balance current to flow, a switch device having a large current capacity is used. Since the voltage switch 4 - 4 reads the terminal voltage of the cell, its current capacity may not be large.
  • the voltage switch 4 - 4 since the voltage switch 4 - 4 has a hold function, it can measure voltages with a same timing.
  • a control section 4 - 3 controls a cell address or performs a hold control.
  • the cell address receives an address clock (AdrClk) pulse from the CPU 2 - 1 and selects one of the cells (B 1 , B 2 , B 3 , B 4 ).
  • AdrClk address clock
  • the address clock (AdrClk) pulse is converted into a signal level of the balance control circuit at a signal level of the CPU through an interface 4 - 2 .
  • the balance hold pulse (BH) is also converted into a signal level of the balance control circuit at a signal level of the CPU through the interface 4 - 2 .
  • the balance hold pulse is provided to read the cell voltage during the balance period.
  • the reading hold pulse (RH) is inputted to synchronize all the multicell battery packs, from the exterior.
  • the balance hold pulse (BH) is not synchronized with the other multicell battery packs and is outputted from the CPU 2 - 1 so as to perform the voltage reading with an individual timing.
  • the reading balance pulse (RB) When the reading balance pulse (RB) is inputted into the multicell battery pack, an operating state becomes under reading mode, the current switch is off and the cell (B 1 ) is addressed.
  • the reading hold pulse (RH) When the reading hold pulse (RH) is inputted into the battery pack, the cell voltage is held in a condenser. Then, when the address clock (AdrClk) is once inputted, the cell (B 2 ) is addressed.
  • the voltage switch 4 - 4 is not directly connected to the cells (B 1 ⁇ B 4 ) but connected to the condenser holding the voltages of the cells (B 1 ⁇ B 4 ).
  • the current switch 4 - 5 is directly connected to the cells (B 1 , B 2 , . . . ).
  • the current switch 4 - 5 is off at the reading balance mode. If the balance address is shifted to pass over the cell (B 4 ), the switch of the master module is off and the switch of the slave module is on.
  • Each cell voltage from the voltage switch 4 - 4 is fixed at the ground since the hold voltage is being read. Accordingly, the voltage of the master module can be directly read with the CPU, but the voltage of the slave module is connected to the ground potential through a calculation amplifier 2 - 10 since it is required to shift the voltage of the slave module into the ground voltage.
  • the current switch 4 - 5 When it is converted to the balance mode from the reading balance mode, the current switch 4 - 5 is on. Also in the balance mode, the voltage is repeatedly measured in sequence from the cell (B 1 ) to the cell (B 4 ).
  • the CPU 2 - 1 When it is desired to enable the current to flow to one of the cells, the CPU 2 - 1 outputs an on/off control signal to make the balance current on.
  • the on/off of the balance current is described with the function of the auxiliary switch 2 - 3 , it can be also performed with the DC-DC converter 2 - 2 or current switches 4 - 5 , 6 - 5 .
  • the current switch cannot be directly connected since the ground potentials of the master module and the slave module are different. Accordingly, the auxiliary switch 2 - 3 is used.
  • the auxiliary switch 2 - 3 turns on the switch of the master module in case that it addresses the cells (from B 1 to B 4 ) by the control signal of the controller 4 - 3 , and turns on the switch of the slave module in case that it addresses the cells (from B 5 to B 8 ).
  • the reading hold pulse (RH) and the reading balance pulse (RB) are transmitted from the master module to the slave module through the vertical interface 4 - 1 .
  • the reading hold pulse (RH) and the reading balance pulse (RB) are transmitted from the master module to the slave module through the vertical interface 4 - 1 .

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Materials Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)
  • Tests Of Electric Status Of Batteries (AREA)
  • Battery Mounting, Suspending (AREA)
US11/722,776 2004-12-24 2005-12-22 System for controlling voltage balancing in a plurality of lithium-ion cell battery packs and method thereof Active 2026-07-13 US7663341B2 (en)

Applications Claiming Priority (4)

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KR1020040112021 2004-12-24
KR10-2004-0112021 2004-12-24
KR20040112021 2004-12-24
PCT/KR2005/004451 WO2006068429A1 (en) 2004-12-24 2005-12-22 System for controlling voltage balancing in a plurality of litium-ion cell battery packs and method thereof

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US7663341B2 true US7663341B2 (en) 2010-02-16

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US (1) US7663341B2 (de)
EP (2) EP2400627B1 (de)
JP (2) JP4611387B2 (de)
KR (1) KR100660729B1 (de)
CN (2) CN101088203B (de)
CA (1) CA2591789C (de)
TW (1) TWI305442B (de)
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US11509144B2 (en) 2020-06-02 2022-11-22 Inventus Power, Inc. Large-format battery management system with in-rush current protection for master-slave battery packs
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KR100680901B1 (ko) * 2006-02-28 2007-02-09 김금수 배터리 관리 시스템 및 그 제어 방법
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KR101016813B1 (ko) * 2009-05-19 2011-02-21 에스비리모티브 주식회사 배터리 관리 시스템 및 그 구동 방법
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